ORDER 70. COMPOSITE 423 



17 A amethystinus Xutt. ? Clothed with a minute hoary tomentum ; st. 

 racemous-paniculate ; Ivs. linear-lanceolate, entire, rough, acute, with somewhat 

 auricalate appendages at the clasping base ; invol. broad-bell-shaped ; scales 

 hispid-pubescent, imbricated, erect, with acute squarrous, green tips ; ach. silky. 

 Found at Xorthbridge, Ms. (by Dr. Robbins, and by us). Hds. with showy blue 

 rays, expending 1'. Differs from Xuttall's descr. ia its scales which are not of 

 equaldength. Sept. 



18 A. punfceus L. St. hispM, paniculate ; Ivs. amplexicaul and more or less 

 auriculate at base, appressed serrate, roughish above ; invol. loose, longer than the 

 disk, the scales linear-lanceolate, long and revolute, nearly equal and 2-rowed. A 

 large, handsome aster, common in swamps and ditches, sometimes in dry soils, 

 X. States and Can. St. 4 to 6f high, generally red (at least on the South side), 

 furrowed, hispid. Lower Ivs. with remote serratures, rough-edged and rough on 

 the upper surface, all acuminate and narrowed at base. Fls. large and showy. 

 Rays 50 to 80, long and narrow, pale-purple. Aug. Oct. 



J3. viMiXEUS. Tall and nearly glabrous, slender ; branches divaricate-ascend- 

 ing, mostly 1-flo \vered; Ivs. linear-lanceolate, sparingly oppressed-serrate, 

 taper-pointed, auriculate-amplexicaul ; hds. very large ; scales leafy. In damp 

 woods. Rays spreading 18 to 20". 



19 A. prenanthoides Muhl. St. hairy or pubescent above, corymbous-panicu- 

 late ; Ivs. oval-lanceolate, serrate, acuminate, attenuate at base into a long winged 

 petiole which is auriculate at the insertion ; invoL imbricated with several rows of 

 linear, green-tipped, spreading scales. Grows in low woods, X. Y. to Ky. Stem 

 2 3f high, with a terminal, corymbous panicle of large heads on short pedun- 

 cles. Rays showy, pale blue. Leaves with the petiole 5 to 10' long. Branch 

 leaves smaller, nearly entire. Sept. Xov. 



20 A. laevis L. Very smooth; st. angular; brancJtes simpk, \-ftowered; Ivs. 

 half-clasping, oblong, entire, shining, radical subserrate, lanceolate, upper auri- 

 cled at base; invol. closely imbricate, the scales broadly linear, rigid, thickened 

 and herbaceous at the apex ; ach. glabrous. A very smooth and beautiful species, 

 2 to 3f high, growing in low grounds. St. polished, green, often somewhat 

 glaucous ; Ivs. rather fleshy, the lowest tapering to a winged petiole. Fls. large 

 and showy, with numerous rays of a fine blue becoming purple. Sept. Xov. 

 (A. mutcbilis L. A. amplexicaulis Muhl.) 



fi. L.EVIGATUS. Lvs. long, linear-lanceolate. (A. Isevigatus Willd.) 

 y. CYAXEUS. St. ami Ivs. conspicuously glaucous. (A. cyaneus Ph.) Beau- 

 tiful varieties, especially the latter. 



21 A concinrms Willd. not of Xees. St. simple, paniculate or racemous, pubes- 

 cent; Ivs. lanceolate and lance-linear, narrowed and clasping at the base, remotely 

 serrate, upper ones entire. Invol. closely imbricate, scales green at the tip. 

 Woods, X. States. A slender species 1 to *2f high. Branches of the panicle 

 rather short and remote. Lvs. 3 to 5' long, acuminate, varying from to 1', in 

 width, saiooth except the midvc-in beneath, branch Ivs. few and much smaller. 

 lids, middle eize, with 10 to 15 bluish-purple rays. Sept. Xov. 



22 A. sericeus Vent. Sts. slejider, clustered, glabrous below, silky, pubescent, 

 branched above ; Ivs. clothed on both sides with a dense, appressed, silky-canes- 

 cent tomentum, lance-oblong, entire, acute and mucronate, sessile; hds. large, 

 mostly solitary, terminal' on the short, leafy Iranchkts; scales lanceolate, silky- 

 canescent like the Ivs., spreading at tip ; ach. smooth. A singularly elegant 

 Aster, with shining, silvery foliage, prairies ami river banks, Wise, and Iowa to 

 Miss. St. 1 to 2f high. Lower Ivs. 2 to 3' by 9 to 16". the upper much smaller. 

 Rays deep violet-blue. Pappus fulvous. Aug. Oct. f (A argenteus MX.) 



23 A. concolor L. St. subsimple, erect, pubescent; Ivs lance-oblong, entire, 

 mucronate, grayish, with a minute, silky pubescence both sides, upper ones cus- 

 pidate-acuminate ; roc. terminal, virgate, simple or somewhat compound, elon- 

 gated ; scales lanceolate, silky, acute, appressed ; ach. villous. Pine barrens, X. 

 J. to Fla. A slender and virprate plant, 1 to 3f high, sometimes branched below. 

 Et. often tuberous. Lvs. IV by i', reduced in size upwards. Hds. in a long 

 rac., with purple ravs and a rust-colored pappus. Aug. Xov. Resembles a 

 Liatris. 



